The fixtures appear to be your basic recessed cans, with an outdated type of trim. Remember, even into the 60's there was a lot more reliance upon "A" type bulbs ('normal bulbs'), and limited availability of all the reflector types we now take for granted.
Likewise, metal was used for a lot of things that are, today, plastic.


As for the chandelier, Ian is probably right .... there's likely a cord plugged into the socket. Here's a pic of such a pigtail:


[Linked Image]


I don't recall ever seeing such fixtures in the stores ... but clearly they were at one point. Still, I am curious as to how that chandelier is supported.